The speed of a motor increases from 1200 rpm to 1800 rpm in 20s How many revolutions does it make in this period of time
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2
Answer:
Given,
ω
0
=1200rpm=20rps
ω=1800rpm=30rps
t=20sec
From the rotational mechanics
ω=ω
0
+αt
α=
t
ω−ω
0
α=
20
30−20
=0.5rps
2
The number of rotation,
θ=ω
0
t+
2
1
αt
2
θ=20×20+
2
1
×0.5×20×20
θ=400+100=500rotation
The correct option is C.
Explanation:
Hope it is helpful to you.........
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